NTE875 Integrated Circuit Video IF Amplifier/PLL Detector System Description: The NTE875 is a complete video IF signal processing system on a single 28–Lead DIP type package. This device contains a 5–stage gain–controlled IF amplifier, a PLL synchronous amplitude detector, self–contained gated AGC, and a switchable AFC detector. The increased flexibility of the NTE875 makes it suitable for a wide variety of television applications where high quality video or sound carier recovery is required. These include home receiver video IFs, cable and subscription TV decoders, and parallel sound IF/intercarrier detector systems. Typical operating frequencies are 38.9MHz, 45.75MHz, 58.75MHz, and 61.25MHz. Features: D Low Differential Gain and Phase D IF and Detector pin Compatible with NTE878 (Discontinued) D Common–Base IF Inputs for SAW Filters D True Synchronous Video Detector using PLL (Phase Lock Loop) D Excellent Stability at High System Gains D Noise–Average Gated AGC System D Uncommitted AGC Comparator Input D Internal AGC Gate Generator D Superior Small–Signal Detector Linearity D AFC Detector with Adjustable Output Bias D 9MHz Video Bandwidth D Reverse Tuner AGC Output Absolute Maximum Ratings: Power Supply Voltage, V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V IF Supply Current, I5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mA AGC Gate Voltage, V14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5V Video Output Current, I16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Phase Lock Loop (PLL) Filter Current, I18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA Detector Input Signal, νDET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Vrms Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2W Thermal Resistance, Junction–to–Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50°C/W Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +125°C Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C Lead Temperature (During Soldering, 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260°C DC Electrical Characteristics: (TA = +25°C, VIF = νDET = 0, VPH = 4V, VCOMP = 4V, and all switches in position 0 (open) unless otherwise specified) Parameter Symbol 12V Supply Current I1 + I2 IF Regulator Voltage V5 Test Conditions Min Typ Max Unit VAGC = 6.7V, VCOMP = 6V 35 60 80 mA VAGC = 6.7V, SW4 Position 1 5.8 6.4 7.0 V VAGC = 2V, SW2, 3, 4 Position 1 3.2 3.7 4.1 V – 0 ±30 mV IF Input Voltage V7, V8 IF Decouple Offset V6 – V9 VAGC = 2V, SW2, 3, 4 Position 1 IF Peaker Voltage (Max Gain) V3, V4 VAGC = 2V, SW2, 3, 4 Position 1 2.3 3.0 3.6 V I1 VAGC = 9V, SW2, 3, 4 Position 1, Measure V1, I1 = (12 – V1)/50 3.1 5.5 7.8 mA V3, V4 VAGC = 9V, SW2, 3, 4 Position 1 5.5 6.2 – V V28 VAGC = 6.7V, SW1, 4 Position 1 4.3 4.9 5.5 V Limiter Tank Voltage V24, V25 VAGC = 6.7V, SW1, 4 Position 1 6.4 7.0 7.6 V AFC Tank Voltage V23, V26 VAGC = 6.7V, SW1, 4 Position 1 4.3 4.9 5.5 V VCO Tank Voltage V19, V20 VAGC = 6.7V, SW1, 4 Position 1 4.7 5.2 5.7 V 3.8 4.0 4.2 V – 0 ±5 µA 1.6 2.2 2.8 mA IF Output Current IF Peaker Voltage (Min Gain) Detector Input Voltage AGC Sync Threshold V17 SW1, 2 Position 1, Adjust VCOMP for I13 = 0 AGC Filter Leakage Current I13 SW1, 2, 4 Position 1 AGC Filter Charge Current I13 SW1, 2 Position 1, VCOMP = 3.5V AGC Filter Discharge Current I13 SW1, 2 Position 1, VCOMP = 4.5V RF AGC Leakage Current I11 VAGC = 2V, All Switches Position 1, Measure V11, I11 = (12 – V11)/6000 – 0 20 µA RF AGC Output Current I11 VAGC = 10V, All Switches Position 1, Measure V11, I11 = (12 – V11)/6000 1.5 1.8 – mA –0.45 –0.70 –0.90 mA Detector AC Set–Up Procedure: (SW1, 4 position 1, VAGC = 0V) 1. Apply νDET = 10mVrms, 45.75MHz CW at the detector input. Tune L1 for maximum AC signal at Pin25, measured with a 10x FET probe or through a 1pF capacitor to prevent loading of the limiter tank. 2. Increase νDET to 60mVrms. Adjust L3 until the PLL locks, as indicated by a DC voltage at the video output Pin16. 3. With the detector locked, adjust L3 for 4V at Pin18. 4. Adjust VPH for maximum detector efficiency by monitoring Pin16 for a minimum DC voltage. 5. Adjust L2 for 3.0V at Pin27 (on sensitive slope of AFC curve). AC Electrical Characteristics: (TA = +25°C, Detector set–up as above, f = 45.75MHz, VAGC = 6.7V, VCOMP = 4V, and allswitches in position 0 (open) unless otherwise specified) Parameter IF Amplifier Gain Symbol Test Conditions νOUT/νIF VAGC = 2V, SW2, 3, 4 Position 1, νIF = 500µVrms, Note 1 Min Typ Max Unit 25 35 – dB VAGC for 15dB Gain Reduction SW2, 3, 4 Position 1, νIF = 2.8mVrms, Adjust VAGC for Same νOUT as Gain Test 4.2 4.6 5.0 V VAGC for 45dB Gain Reduction SW2, 3, 4 Position 1, νIF = 89mVrms, Adjust VAGC for Same νOUT as Gain Test 5.1 5.5 6.1 V AC Electrical Characteristics (Cont’d): (TA = +25°C, Detector set–up as above, f = 45.75MHz, VAGC = 6.7V, VCOMP = 4V, and allswitches in position 0 (open) unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Zero Carrier Level V16 SW1, 2, 4 Position 1, νDET = 0 6.6 7.4 8.4 V Detected Output Level ∆V16 SW1, 2, 4 Position 1, νDET = 60mVrms, Measure Change in V16 from Zero Carrier Test 2.0 3.0 4.3 V Overload Output Voltage V16 SW1, 2, 4 Position 1, νDET = 600mVrms – 2 3 V AFC Output Voltage (OFF) V27 SW1, 2, 4 Position 1, νDET = 0 2.8 3.0 3.2 V AFC Minimum Output Voltage V27 SW1, 4 Position 1, νDET = 60mVrms, 46.75MHz – 0.5 1.0 V AFC Maximum Output Voltage V27 SW1, 4 Position 1, νDET = 60mVrms, 44.75MHz 9 10 – V SW1, 4 POsition 1, νDET = 60mVrms, Vary Frequency and Measure the Difference between Lock Points 2 3 – MHz PLL Pull–In Range ∆f Note 1. The IF amplifier gain is specified with the IF output connected to a 50Ω measurement system which results in a 25Ω loaded impedance. The gain in an actual application will typically be 26dB higher. Pin Connection Diagram IF Output 1 28 Detector Input VCC 2 27 AFC Output IF Gain Adjust 3 26 AFC Tank IF Gain Adjust 4 25 Limiter Tank IF Supply 5 24 Limiter Tank IF Decouple 6 23 AFC Tank IF Input 7 22 Detector Phase Adjust IF Input 8 21 Substrate GND IF Decouple 9 20 VCO Tank IF GND 10 19 VCO Tank RF AGC Output 11 18 PLL Filter RF AGC Takeover Adjust 12 AGC Filter 13 AGC Gate Generator Time Constant 14 17 Input to AGC Comparator 16 Video Output 15 Supply Decouple 14 1 15 28 1.469 (37.32) Max .540 (13.7) .250 (6.35) .100 (2.54) 1.300 (33.02) .122 (3.1) Min .600 (15.24)